First, we should understand our friend, the clitoris. The clitoris is a complex structure which includes the external and internal components. Visible to the eye is the clitoral hood (prepuce) which in full or part covers the head (clitoral glans), shaft and inner lips (labia minora). Inside the body are the legs or clitoral crura, urethral sponge, clitoral bulb (previously referred to as vestibule bulb) and corpora, perineal sponge, a network of nerves and blood vessels, suspensory ligaments, muscles and pelvic diaphragm. You don't see these guys, but they are very important. The clitoris extends from the front commissure where the edges of the outer lips (labia majora) meet at the base of the pubic mound to the fourchette. [4]In humans, the clitoral shaft then extends several centimeters upwards and to the back, before splitting into the two legs, and shaped like an inverted "V", these crura extend around and to the interior of the outer labia. Thus, what you see, is not what you get--it is only the beginning of what you get.
Masters and Johnson were the first to determine that the clitoral structures surround and extend along the vagina, determining that all orgasms are of clitoral origin. [5] More recently, Australian urologist Dr. Helen O'Connell using MRI technology noted that direct relationship between the legs or roots of the clitoris and the erectile tissue of the clitoral bulbs and corpora, and the distal urethra and vagina. [6]She asserts that this interconnected relationship is the physiological explanation for the G-spot and women’s experience of vaginal orgasm taking into account the stimulation of the internal parts of the clitoris during vaginal penetration. NOTE: it took a woman doctor to explain that women do indeed have tissue with orgasm writtin all over it. [7]Women who experience orgasm from both direct clitoral stimulation of the glans and vaginal access to the internal bodies distinguish between them in terms of both the physical and general sensations associated with each. We gals pick up on these differences pretty early and appreciate refining them over time.
And more directly to your point:
During sexual arousal and during orgasm, the clitoris and the whole of the female genitalia engorge and change color as these erectile tissues fill with blood, and the woman experiences vaginal contractions. Master and Johnson created the sexual response cycle which has four phases and is still the clinically accepted definition of the human orgasm. More recent research has documented that women can experience a sustained intense orgasm through stimulation of the clitoris and remain in the orgasmic phase for much longer than the original studies indicate, evidenced by genital engorgement and color changes, vaginal contractions and ejaculation.
What a beautiful process. Even straightforward medical talk can' cover what an intense process this is--and it is disconnected from propogation and it is solely the woman's. There is nothing better--no sport, no drug, no nothing that even gets close to that.